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Disaster Management and The Power of Science

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Rainfall Over Sri Lanka 27-29 November 2025 (Source: Sri Lanka Department of Meteorology)

The key to managing future disasters is through the smart utilisation of science

Living With Nature

As Sri Lanka has witnessed through the intense impact of Tropical Cyclone Ditwah, the power of nature is there for all to see, feel, hear, and grieve over. The hubris of humanity deludes us. We cannot control nature in its most powerful manifestation. The lesson we should learn is to live with nature, listen to nature, and learn from nature. The most effective method of managing disasters, mitigating disasters, or even avoiding disasters is to smartly apply the science that is readily available to all. Smart science utilisation educates all about the magnitude, scale, duration and likely outcomes of natural phenomena. This approach feeds into developing a culture of living with nature, planning our country with nature in mind, training the scientists we need, strengthening scientific and disaster management departments and institutions, joining up decision makers and scientists, and dramatically increasing the scientific awareness of the whole population. This is a sure-fire way of reducing the devastation of potential disasters. BUT: it’s a hard road, a difficult road, and one that requires the sustainability of a safe nation focus, decade after decade. This article focuses briefly on the science of cyclones/storms, rivers, and landslides: the three natural phenomena that bring the most frequent disasters to Sri Lanka.

Worldwide Cyclone Paths

Bay of Bengal Cyclone Paths

Cyclone Ditwah and Sri Lanka (Source https://zoom.earth/storms/ditwah-2025)

Tropical Cyclone

Tropical Cyclones originate between latitudes 10 degrees north and south of the equator. They form through heat interactions of warm surface ocean waters and the atmosphere. Cyclones move from the equator to the north and south, seeking the warmest parts of the ocean to sustain and build their formation. Cyclones are heat-seekers and can only survive while warm surface ocean waters continuously feed intense convection systems that create enormous spiral clouds rotating around a central column. Thankfully, most cyclones are born and die harmlessly within ocean space. But when they make landfall they release their pent-up energies in the form of winds, rain, and storm surges (oceans can be sucked up like tsunamis by intensely low-atmospheric pressures associated with cyclones). The most powerful cyclones generate winds of 300 to >400km/hour, air pressures as low as 870mb, total rainfalls of over 6m, and highest rainfall intensities of 1.14m/24 hours and >400mm/hour. Cyclones mainly affect countries located between latitudes 10 and 30 degrees north and south of the equator. Regions such as East Asia, the Caribbean/Gulf of Mexico and Indian/Pacific Ocean Islands are the most impacted cyclone areas. Sri Lanka is lucky, as relatively few cyclones make landfall, tending to move further north before they strike.

Cyclone Ditwah and Sri Lanka

Cyclone Ditwah was rapidly born SW of Sri Lanka, growing from a meteorological depression on the 26th of November 2025. It moved east and north crossing Sri Lanka over the next few days, retaining a low-pressure identity until December 3rd. It formed through the presence of warm ocean around Sri Lanka and concurrent atmospheric conditionalities.

Bay of Bengal Cyclone Paths (source Monas et al., Tropical Cyclone Research & Review, 2022)

Rainfall Over Sri Lanka 27-29 November 2025

The slow-moving nature of Cyclone Ditwah significantly increased its impacts. As cyclones go, wind speeds were on the low side (50-90km/hour) and the air pressure relatively high (1002 mb). Ditwah did, however, release large amounts of rainfall over 2-3 days of protracted rainfall, and over large areas of Sri Lanka. Total rainfalls of 150-500mm occurred alongside rainfall intensities of 300mm/24 hours. A similar slow-moving tropical depression hung around the mountains of Guadalcanal, Solomon Islands, for several days during April 2014, releasing over 700mm of rainfall, which created severe flooding in the national capital town of Honiara.

Storms and Monsoons

Cyclones are examples of extreme storms. Storms are a more frequent and regular weather phenomenon within Sri Lanka. Whatever label is given to weather systems the important data we need for managing rain hazards includes the timing and duration of storms, their predictability, the earliest warning signs we can detect, likely wind speeds and durations, rainfall amounts and distribution, and areas most likely to be affected by storms.

Sri Lankan Monsoons

Sri Lankan Monsoons (Source Ceylon Tour Guide Drivers)

Sri Lanka’s meteorological patterns are well known and documented by the SL Department of Meteorology and other sources. The drivers, durations, weather patterns, and areas affected by the two monsoons (from the southwest and northeast at different times of the year) are common knowledge. Furthermore, incidents of disasters caused by intense storms have produced a plethora of data that can be used to inform disaster management and planning. The science of meteorology has been revolutionized over the past decades through the advent of sophisticated satellite, airborne, and ground weather sensors, alongside big-data multiple-scenario mega-computer modelling capabilities, and an abundance of highly trained meteorological scientists. The recognition of climate change, particularly since the late 1990s, has led to a quantum leap in in research and financial investments, and hardware/software/ scientific advances. We now know our weather systems and the physics of the atmosphere with an enviable level of prediction/modelling when viewed through the eyes of the 1960/70s or 80s generations

Whither the Weather Data: what’s the Point?

There is no substantial reason or excuse why countries, regions, communities, scientists, and decision-makers cannot turn all the amazing weather data and capability into tools and practical applications to mitigate future disasters. The science is so smart and powerful that a failure to use its helpful essence is plain foolishness. The data, and approach suggested, as we will see below, with river and landslide science, can undoubtedly deliver a safer country and world. Bangladesh, a poor country with a population of 172 million is regularly hit by cyclones, storms. and high magnitude floods. Cyclone Bhola, in 1970, killed half a million people and wiped out 85% of the nations homes. And yet, this low-income nation has impressively adopted new smart disaster management ways, including integrating science, greatly reducing the impacts of disasters over time.

Allowing Rivers to Run Free

Sri Lanka River Basins

Sri Lanka has over 100 river basins, (or catchments), the largest of which (the Mahaweli) has an area of over 10,000km2. The Mahaweli River extends to over 335 km in length. Sri Lankan rivers are mostly aligned in a radial fashion, centred upon South-Central Highlands, flowing to all corners of the country. Rivers are the lifeblood of any country. They are like blood vessels in the human body. If we fail to look after rivers, environments degrade, human and animal life suffers, and disasters are heightened in magnitude.

Modern (and ancient) philosophers ask us to view rivers not as inanimate natural features, but as sentient living beings. The science of hydrology (study & understanding of water systems) enables humans to optimally manage rivers and related eco-landscape systems, and to live safely with rivers. The latest thinking is moving towards the idea of allowing rivers to run freely: for humans to adopt the principle living respectfully and safely with the vital lifeblood of any country or region.

Rivers form through rain (and snow) falling on land and organising themselves according to the physical laws of drainage. Just as we engineer drainage in our houses so that we stay dry, and channel the waters where we want them to go, nature drains our lands. Rivers will follow the easiest path they can from the highest areas of their river basins (or catchments) to the lowest point they can reach (usually the ocean, sometimes local lakes or inland seas). Rivers follow geology and topography, but also mould and shape landscapes themselves, over time.

They are fed from water reservoirs that come from the sky, from vegetation root systems, and from large underground reservoirs. Geological structures, geological bedrock and geological surface deposits all influence rivers. Gravity will dictate how water flows through any landscape.

The nature of rivers changes according to the quantity and rate of water they transport. During times of low rainfall and drought they will occupy only a small part of their channels. With heavy and intense rain, they rise and often break out of their channels flooding their hinterland (termed floodplains). The rise and fall of rivers are natural. When rivers are at their highest their sheer hydraulic power is thousands of times greater than during the quiet times. Floods have provided humans with fertile plains, regularly renewing land with fresh silt and mud, and the sapphires, garnets, and rubies Sri Lanka is famous for. Science allows us to deeply understand the nature and behaviour of rivers: why they occupy their courses, why they go dry, why they flood, how much they flood, how they erode, how they deposit, and how they can carry different sizes and volumes of material.

Modern scientific sensors can accurately map rivers, measure the rainfall within their catchments, their flow rates, and the shape and form of their river channels. Modern computer modelling can accurately predict the size, duration, time, magnitude, and likely impact of floods. Mapping of geological river deposits informs us of the extent of floods over time in any river system. Science can monitor rivers, inform us about groundwater reservoirs and health, pollution within rivers, and how human impacts are influencing river processes.

Worldwide Cyclone Paths (source Nature 2020, https://doi.org/10.1038/s41597-020-0381-2

Most rivers in the world have been engineered by humans in a wide variety of ways. Dams, canals, river re-routing, energy generation, water storage, water pumping schemes, irrigation, and industrial utilisation, are examples. Intelligent utilisation of river resources has been of great human benefit. However, as with any natural system, there is a threshold beyond which damage is caused to the arteries of the nation. River catchment (basin) development can occur with no mindfulness of river-health. Mountainsides are denuded of trees, houses and urban areas grow quickly with disregard to river-natures, the natural architecture of land and river drainage is altered so much that water run-off significantly increases, and the impact of floods increases dramatically.

Whilst humans must use river resources to sustain modern livelihoods, the wider utilisation of science to inform our activities, and the greater the adoption of the principle of allowing rivers to run free, the safer our world will be. Our rivers and ecosystems will smile widely. Simple science-informed guidance such as avoiding building houses in flood plains, caring for the slopes that feed our rivers, and limiting rapid water urban run-off can be adopted by all. The idea of ‘sponge’ cities where urban environments soak up and store water, rather than increasing run-off is catching on in Singapore, China, and Denmark.

Sri Lanka’s population growth 1871 – 2001 (https://commons.wikimedia.org/wiki/File:SL_population_ growth.png)

Carefully safeguarding, and maximising the anti-flood control potentials of the beautiful wetland network of Colombo, and the incredible intelligent irrigation systems built from over 2000 years ago in central-north Sri Lanka is essential for a future safe Sri Lanka.

The Science of Landslides

Landslides occur in different shapes and forms but essentially move material quickly downslope through the force of gravity. They can vary in size, style, and magnitude, from slow but persistent peripheral movement of surface layers, to rapid movement of large quantities of rock and surficial deposits over significant distances. One large recent earthquake in Enga province, Papua New Guinea (2024) formed from the collapse of a large part of a mountainside, burying villages and leading to the deaths of up to 2000 people. Some of the world’s largest landslides transport cubic kilometres of material, and have killed 20,000 – 200,000 in China, Venezuela, and Peru.

Landslide Prone areas in Sri Lanka

Sri Lankan landslides mostly occur within the central Highlands region and peripheral areas, particularly in the southwest.

Debris Flow Rotational Landslide (Source Utah Geological Survey)

Much of Sri Lankan geology is comprised of hard crystalline rocks called gneiss: this forms the bulk of the nation’s upstanding mountains. Whilst intrinsically a hard and strong rock, Sri Lankan gneisses are weathered deeply by a hot, humid, tropical climate. Chemical weathering breaks down bedrock, forming thick deposits of altered degraded, material, termed regolith. These deposits can be 10m-> 30m thick. They lack the intrinsic cohesive strength and structure of the gneissic bedrock from which they form. Regolith is often reddish in colour due to the presence of abundant iron hydroxides.

Debris Flow Rotational Landslide

Sri Lankan landslides are mostly termed debris flows, involving the rapid downslope movement of moderate to large volumes of surficial regolith material downslope.

The causes of landslides are well known, as are areas of landslide high-risk. Landslides occur on steep or moderate slopes, particularly within areas of high relief. Triggers for landslides include earthquakes, volcanic eruptions, and high intensity rainfall. For Sri Lanka heavy rainfall, persistent rainfall, or alternating protracted periods of heavy and/or persistent rain with contrasting drought seasons are the main landslide triggers. Persistent-protracted monsoonal rainfall can seep deeply within surface regolith material, particularly if the materials are porous and permeable (capable of soaking and transporting water within its mass, like a sponge).

When the regolith becomes sodden with water its weight increases many times, internal friction is reduced, and lubrication increased. The ever-present gravity pulls with greater force on this wet, heavy, lubricated regolith. When this gravitational force exceeds the ‘sticking’ force that binds the regolith to the mountainside, the material slips and forms a landslide. Ancient and recent landslide deposits can be geologically mapped, helping us understand where and why landslides have occurred in the past. This mapping helps us identify and locate high-risk zones. Slope strength can be monitored through slope-stress sensors. In Hong Kong, a city of millions built on steep tropical slopes, every high-risk slope is catalogued, drained of water, strengthened through engineering, and regularly monitored.

Human activities can significantly increase the risks of landslides. Any activity that reduces the stability of slopes increases the probability of landslides. Cutting down trees, steepening slopes through engineering, and retarding natural slope-drainage, will all increase the likelihood of landslides. Moving human settlement to high-risk zones increases the exposure of people to landslide risks. Human interventions can reduce landslide risks by planting trees with deep root systems on slopes, increasing the natural drainage of slopes, and monitoring slope stability through simple observations such as observing the onset or long-term occurrence of surface cracks, road and wall slippage, and cracks appearing in buildings on slopes.

Increasing urbanisation in Colombo 1995-2017 (Source https://archive.roar.media/english/life/in-the-know/urbanisation-sri-lanka-growing-pains)

Landslides are a natural phenomenon and are part of the beauty of landscape formation. They have occurred long before humans existed and will continue to do so long after humans. The science of landslides is well understood and can help us all live more safely, at lower levels of risk. It is up to us to take notice of nature and live wisely with the nature of landslides.

Demographics and Development

Whilst climate change has had numerous impacts on weather systems, particularly in increasing the capacity of clouds to hold water, and rain more intensely, along with increasing the power of winds, we cannot blame everything on climate change. In days gone by we used to blame gods, now we blame climate change. We need to adapt to climate change, full stop. There are many things we are in control of and can change. More importantly, we need to become increasingly aware of the link between demography, socio-economics, urban development, and increasing environmental risks. These phenomena are all in our hands.

For most of human history global populations numbered millions and tens of millions. By 1804 the global population reached 1 billion, 2 billion during the early twentieth century, almost 3 billion in 1950 and now over 8 billion. This rapid rise in population, together with unprecedented levels of consumerism, has stressed the earth far more than any living species has done so during the past 4 billion years.

Sri Lanka’s population growth 1871 – 2001

Sri Lanka’s population grew rapidly from 2 million in1871, 6 million in 1943, to 22 million today, although it now appears to be reaching a steady state. This rapid population growth has led to concomitant urban growth, particularly around Colombo and the southwest, together with road-ribbon development, virtually continuously for example, between Colombo and Kandy. Mass tourism adds another one or two million high- consuming visitors every year.

Increasing urbanisation in Colombo 1995-2017

Rapid, sub-optimally planned, urban development, not only leads to the rapid generation of less-attractive urban environments (that will deter visitors), but also increases the exposure of a greater number of people to environmental risks. Whilst the power and wisdom of science can produce informed plans for safety and planetary health, the competing power of the development rupee or dollar profit unfortunately wins out. Profit at the expense of nature and environmental safety.

Conclusions: the power of Science: it’s in our hands

This article clearly spells out the practical nature and the power of the science of cyclones, weather, rivers and landslides, and how it can reduce our risks and exposure to potential disasters. Cyclone Ditwah and the 2004 tsunami were clear demonstrations to Sri Lanka of the power of nature. Science informs us, educates us, helps us understand how nature works, devises early warning methods and systems, monitoring tools, and predictive advice. If we apply the science and combine this with decision-makers, government, communities, and industry, we can live with nature and develop towns cities and village sympathetically. This is our choice. It is in our hands. We can avoid placing high populations or vulnerable poor people in areas of high environmental risk. We don’t have to surface this beautiful country with unattractive, never-ending, concrete, plasterboard, and cement. We can, instead, work with natural science, with natural systems, and with nature to create a happier, safer country, in-tune with the non-human as well as the human world.

Honouring all humans and sentient beings who have suffered from Cyclone Ditwah

I express my deep condolences to all who have suffered as Cyclone Ditwah struck. Many died. Many lost their homes, possessions, and loved ones. Many suffered damage to their properties. So many birds animals, insects and sentient beings suffered. Disasters bring deep anguish. Thankfully, the Government, nation, institutions, society and the international community have recognised the level of emergency and are providing assistance in a myriad of forms. I hope that, in a small way, this article presents opportunities to reduce future suffering.

by Prof. Michael G. Petterson



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Making ‘Sinhala Studies’ globally relevant

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On 8 January 2026, I delivered a talk at an event at the University of Colombo marking the retirement of my longtime friend and former Professor of Sinhala, Ananda Tissa Kumara and his appointment as Emeritus Professor of Sinhala in that university. What I said has much to do with decolonising social sciences and humanities and the contributions countries like ours can make to the global discourses of knowledge in these broad disciplines. I have previously discussed these issues in this column, including in my essay, ‘Does Sri Lanka Contribute to the Global Intellectual Expansion of Social Sciences and Humanities?’ published on 29 October 2025 and ‘Can Asians Think? Towards Decolonising Social Sciences and Humanities’ published on 31 December 2025.

At the recent talk, I posed a question that relates directly to what I have raised earlier but drew from a specific type of knowledge scholars like Prof Ananda Tissa Kumara have produced over a lifetime about our cultural worlds. I do not refer to their published work on Sinhala, Pali and Sanskrit languages, their histories or grammars; instead, their writing on various aspects of Sinhala culture. Erudite scholars familiar with Tamil sources have written extensively on Tamil culture in this same manner, which I will not refer to here.

To elaborate, let me refer to a several essays written by Professor Tissa Kumara over the years in the Sinhala language: 1) Aspects of Sri Lankan town planning emerging from Sinhala Sandesha poetry; 2) Health practices emerging from inscriptions of the latter part of the Anuradhapura period; 3) Buddhist religious background described in inscriptions of the Kandyan period; 4) Notions of aesthetic appreciation emerging from Sigiri poetry; 5) Rituals related to Sinhala clinical procedures; 6) Customs linked to marriage taboos in Sinhala society; 7) Food habits of ancient and medieval Lankans; and 8) The decline of modern Buddhist education. All these essays by Prof. Tissa Kumara and many others like them written by others remain untranslated into English or any other global language that holds intellectual power. The only exceptions would be the handful of scholars who also wrote in English or some of their works happened to be translated into English, an example of the latter being Prof. M.B. Ariyapala’s classic, Society in Medieval Ceylon.

The question I raised during my lecture was, what does one do with this knowledge and whether it is not possible to use this kind of knowledge profitably for theory building, conceptual and methodological fine-tuning and other such essential work mostly in the domain of abstract thinking that is crucially needed for social sciences and humanities. But this is not an interest these scholars ever entertained. Except for those who wrote fictionalised accounts such as unsubstantiated stories on mythological characters like Rawana, many of these scholars amassed detailed information along with their sources. This focus on sources is evident even in the titles of many of Prof. Tissa Kumara’s work referred to earlier. Rather than focusing on theorising or theory-based interpretations, these scholars’ aim was to collect and present socio-cultural material that is inaccessible to most others in society including people like myself. Either we know very little of such material or are completely unaware of their existence. But they are important sources of our collective history indicating what we are where we have come from and need to be seen as a specific genre of research.

In this sense, people like Prof. Tissa Kumara and his predecessors are human encyclopedias. But the knowledge they produced, when situated in the context of global knowledge production in general, remains mostly as ‘raw’ information albeit crucial. The pertinent question now is what do we do with this information? They can, of course, remain as it is. My argument however is this knowledge can be a serious source for theory-building and constructing philosophy based on a deeper understanding of the histories of our country and of the region and how people in these areas have dealt with the world over time.

Most scholars in our country and elsewhere in the region believe that the theoretical and conceptual apparatuses needed for our thinking – clearly manifest in social sciences and humanities – must necessarily be imported from the ‘west.’ It is this backward assumption, but specifically in reference to Indian experiences on social theory, that Prathama Banerjee and her colleagues observe in the following words: “theory appears as a ready-made body of philosophical thought, produced in the West …” As they further note, in this situation, “the more theory-inclined among us simply pick the latest theory off-the-shelf and ‘apply’ it to our context” disregarding its provincial European or North American origin, because of the false belief “that “‘theory’ is by definition universal.” What this means is that like in India, in countries like ours too, the “relationship to theory is dependent, derivative, and often deeply alienated.”

In a somewhat similar critique in his 2000 book, Provincialising Europe: Postcolonial Thought and Historical Difference Dipesh Chakrabarty points to the limitations of Western social sciences in explaining the historical experiences of political modernity in South Asia. He attempted to renew Western and particularly European thought “from and for the margins,” and bring in diverse histories from regions that were marginalised in global knowledge production into the mainstream discourse of knowledge. In effect, this means making histories of countries like ours relevant in knowledge production.

The erroneous and blind faith in the universality of theory is evident in our country too whether it is the unquestioned embrace of modernist theories and philosophies or their postmodern versions. The heroes in this situation generally remain old white men from Marx to Foucault and many in between. This indicates the kind of unhealthy dependence local discourses of theory owe to the ‘west’ without any attempt towards generating serious thinking on our own.

In his 2002 essay, ‘Dismal State of Social Sciences in Pakistan,’ Akbar Zaidi points out how Pakistani social scientists blindly apply imported “theoretical arguments and constructs to Pakistani conditions without questioning, debating or commenting on the theory itself.” Similarly, as I noted in my 2017 essay, ‘Reclaiming Social Sciences and Humanities: Notes from South Asia,’ Sri Lankan social sciences and humanities have “not seriously engaged in recent times with the dominant theoretical constructs that currently hold sway in the more academically dominant parts of the world.” Our scholars also have not offered any serious alternate constructions of their own to the world without going crudely nativistic or exclusivist.

This situation brings me back to the kind of knowledge that scholars like Prof. Tissa Kumara have produced. Philosophy, theory or concepts generally emerge from specific historical and temporal conditions. Therefore, they are difficult to universalise or generalise without serious consequences. This does not mean that some ideas would not have universal applicability with or without minor fine tuning. In general, however, such bodies of abstract knowledge should ideally be constructed with reference to the histories and contemporary socio-political circumstances

from where they emerge that may have applicability to other places with similar histories. This is what Banerjee and her colleagues proposed in their 2016 essay, ‘The Work of Theory: Thinking Across Traditions’. This is also what decolonial theorists such as Walter Mignolo, Enrique Dussel and Aníbal Quijano have referred to as ‘decolonizing Western epistemology’ and ‘building decolonial epistemologies.’

My sense is, scholars like Prof. Tissa Kumara have amassed at least some part of such knowledge that can be used for theory-building that has so far not been used for this purpose. Let me refer to two specific examples that have local relevance which will place my argument in context. Historian and political scientist Benedict Anderson argued in his influential 1983 book, Imagined Communities: Reflections on the Origin and Spread of Nationalism that notions of nationalism led to the creation of nations or, as he calls them, ‘imagined communities.’ For him, unlike many others, European nation states emerged in response to the rise of ‘nationalism’ in the overseas European settlements, especially in the Western Hemisphere. But it was still a form of thinking that had Europe at its center.

Comparatively, we can consider Stephen Kemper’s 1991 book, The Presence of the Past: Chronicles, Politics, and Culture in Sinhala Life where the American anthropologist explored the ways in which Sinhala ‘national’ identity evolved over time along with a continual historical consciousness because of the existence of texts such as Mahawamsa. In other words, the Sinhala past manifests with social practices that have continued from the ancient past among which are chronicle-keeping, maintaining sacred places, and venerating heroes.

In this context, his argument is that Sinhala nationalism predates the rise of nationalist movements in Europe by over a thousand years, thereby challenging the hegemonic arguments such as those of Anderson, Ernest Gellner, Elie Kedourie and others who link nationalism as a modern phenomenon impacted by Europe in some way or another. Kemper was able to come to his interpretation by closely reading Lankan texts such as Mahawamsa and other Pali chronicles and more critically, theorizing what is in these texts. Such interpretable material is what has been presented by Prof. Tissa Kumara and others, sans the sing.

Similarly, local texts in Sinhala such as kadaim poth’ and vitti poth, which are basically narratives of local boundaries and descriptions of specific events written in the Dambadeniya and Kandyan periods are replete with crucial information. This includes local village and district boundaries, the different ethno-cultural groups that lived in and came to settle in specific places in these kingdoms, migratory events, wars and so on. These texts as well as European diplomatic dispatches and political reports from these times, particularly during the Kandyan period, refer to the cosmopolitanism in the Kandyan kingdom particularly its court, the military, town planning and more importantly the religious tolerance which even surprised the European observers and latter-day colonial rulers. Again, much of this comes from local sources or much less focused upon European dispatches of the time.

Scholars like Prof. Tissa Kumara have collected this kind of information as well as material from much older times and sources. What would the conceptual categories, such as ethnicity, nationalism, cosmopolitanism be like if they are reinterpreted or cast anew through these histories, rather than merely following their European and North American intellectual and historical slants which is the case at present? Among the questions we can ask are, whether these local idiosyncrasies resulted from Buddhism or local cultural practices we may not know much about at present but may exist in inscriptions, in ola leaf manuscripts or in other materials collected and presented by scholars such as Prof. Tissa Kumara.

For me, familiarizing ourselves with this under- and unused archive and employing them for theory-building as well as for fine-tuning what already exists is the main intellectual role we can play in taking our cultural knowledge to the world in a way that might make sense beyond the linguistic and socio-political borders of our country. Whether our universities and scholars are ready to attempt this without falling into the trap of crude nativisms, be satisfied with what has already been collected, but is untheorized or if they would rather lackadaisically remain shackled to ‘western’ epistemologies in the sense articulated by decolonial theorists remains to be seen.

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Extinction in isolation: Sri Lanka’s lizards at the climate crossroads

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Climate change is no longer a distant or abstract threat to Sri Lanka’s biodiversity. It is already driving local extinctions — particularly among lizards trapped in geographically isolated habitats, where even small increases in temperature can mean the difference between survival and disappearance.

Cnemaspis rajakarunai (Adult Male), Salgala, Kegalle District (In a communal egg laying site)

According to research by Buddhi Dayananda, Thilina Surasinghe and Suranjan Karunarathna, Sri Lanka’s narrowly distributed lizards are among the most vulnerable vertebrates in the country, with climate stress intensifying the impacts of habitat loss, fragmentation and naturally small population sizes.

Isolation Turns Warming into an Extinction Trap

Sri Lanka’s rugged topography and long geological isolation have produced extraordinary levels of reptile endemism. Many lizard species are confined to single mountains, forest patches or rock outcrops, existing nowhere else on Earth. While this isolation has driven evolution, it has also created conditions where climate change can rapidly trigger extinction.

“Lizards are especially sensitive to environmental temperature because their metabolism, activity patterns and reproduction depend directly on external conditions,” explains Suranjan Karunarathna, a leading herpetologist and co-author of the study. “When climatic thresholds are exceeded, geographically isolated species cannot shift their ranges. They are effectively trapped.”

The study highlights global projections indicating that nearly 40 percent of local lizard populations could disappear in coming decades, while up to one-fifth of all lizard species worldwide may face extinction by 2080 if current warming trends persist.

Heat Stress, Energy Loss and Reproductive Failure

Rising temperatures force lizards to spend more time in shelters to avoid lethal heat, reducing their foraging time and energy intake. Over time, this leads to chronic energy deficits that undermine growth and reproduction.

“When lizards forage less, they have less energy for breeding,” Karunarathna says. “This doesn’t always cause immediate mortality, but it slowly erodes populations.”

Repeated exposure to sub-lethal warming has been shown to increase embryonic mortality, reduce hatchling size, slow post-hatch growth and compromise body condition. In species with temperature-dependent sex determination, warming can skew sex ratios, threatening long-term population viability.

“These impacts often remain invisible until populations suddenly collapse,” Karunarathna warns.

Tropical Species with No Thermal Buffer

The research highlights that tropical lizards such as those in Sri Lanka are particularly vulnerable because they already live close to their physiological thermal limits. Unlike temperate species, they experience little seasonal temperature variation and therefore possess limited behavioural or evolutionary flexibility to cope with rapid warming.

“Even modest temperature increases can have severe consequences in tropical systems,” Karunarathna explains. “There is very little room for error.”

Climate change also alters habitat structure. Canopy thinning, tree mortality and changes in vegetation density increase ground-level temperatures and reduce the availability of shaded refuges, further exposing lizards to heat stress.

Narrow Ranges, Small Populations

Many Sri Lankan lizards exist as small, isolated populations restricted to narrow altitudinal bands or specific microhabitats. Once these habitats are degraded — through land-use change, quarrying, infrastructure development or climate-driven vegetation loss — entire global populations can vanish.

“Species confined to isolated hills and rock outcrops are especially at risk,” Karunarathna says. “Surrounding human-modified landscapes prevent movement to cooler or more suitable areas.”

Even protected areas offer no guarantee of survival if species occupy only small pockets within reserves. Localised disturbances or microclimatic changes can still result in extinction.

Climate Change Amplifies Human Pressures

The study emphasises that climate change will intensify existing human-driven threats, including habitat fragmentation, land-use change and environmental degradation. Together, these pressures create extinction cascades that disproportionately affect narrowly distributed species.

“Climate change acts as a force multiplier,” Karunarathna explains. “It worsens the impacts of every other threat lizards already face.”

Without targeted conservation action, many species may disappear before they are formally assessed or fully understood.

Science Must Shape Conservation Policy

Researchers stress the urgent need for conservation strategies that recognise micro-endemism and climate vulnerability. They call for stronger environmental impact assessments, climate-informed land-use planning and long-term monitoring of isolated populations.

“We cannot rely on broad conservation measures alone,” Karunarathna says. “Species that exist in a single location require site-specific protection.”

The researchers also highlight the importance of continued taxonomic and ecological research, warning that extinction may outpace scientific discovery.

A Vanishing Evolutionary Legacy

Sri Lanka’s lizards are not merely small reptiles hidden from view; they represent millions of years of unique evolutionary history. Their loss would be irreversible.

“Once these species disappear, they are gone forever,” Karunarathna says. “Climate change is moving faster than our conservation response, and isolation means there are no second chances.”

By Ifham Nizam ✍️

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Online work compatibility of education tablets

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Enabling Education-to-Income Pathways through Dual-Use Devices

The deployment of tablets and Chromebook-based devices for emergency education following Cyclone Ditwah presents an opportunity that extends beyond short-term academic continuity. International experience demonstrates that the same category of devices—when properly governed and configured—can support safe, ethical, and productive online work, particularly for youth and displaced populations. This annex outlines the types of online jobs compatible with such devices, their technical limitations, and their strategic national value within Sri Lanka’s recovery and human capital development agenda.

Compatible Categories of Online Work

At the foundational level, entry-level digital jobs are widely accessible through Android tablets and Chromebook devices. These roles typically require basic digital literacy, language comprehension, and sustained attention rather than advanced computing power. Common examples include data tagging and data validation tasks, AI training activities such as text, image, or voice labelling, online surveys and structured research tasks, digital form filling, and basic transcription work. These activities are routinely hosted on Google task-based platforms, global AI crowdsourcing systems, and micro-task portals operated by international NGOs and UN agencies. Such models have been extensively utilised in countries including India, the Philippines, Kenya, and Nepal, particularly in post-disaster and low-income contexts.

At an intermediate level, freelance and gig-based work becomes viable, especially when Chromebook tablets such as the Lenovo Chromebook Duet or Acer Chromebook Tab are used with detachable keyboards. These devices are well suited for content writing and editing, Sinhala–Tamil–English translation work, social media management, Canva-based design assignments, and virtual assistant roles. Chromebooks excel in this domain because they provide full browser functionality, seamless integration with Google Docs and Sheets (including offline drafting and later (synchronization), reliable file upload capabilities, and stable video conferencing through platforms such as Google Meet or Zoom. Freelancers across Southeast Asia and Africa already rely heavily on Chromebook-class devices for such work, demonstrating their suitability in bandwidth- and power-constrained environments.

A third category involves remote employment and structured part-time work, which is also feasible on Chromebook tablets when paired with a keyboard and headset. These roles include online tutoring support, customer service through chat or email, research assistance, and entry-level digital bookkeeping. While such work requires a more consistent internet connection—often achievable through mobile hotspots—it does not demand high-end hardware. The combination of portability, long battery life, and browser-based platforms makes these devices adequate for such employment models.

Functional Capabilities and Limitations

It is important to clearly distinguish what these devices can and cannot reasonably support. Tablets and Chromebooks are highly effective for web-based jobs, Google Workspace-driven tasks, cloud platforms, online interviews conducted via Zoom or Google Meet, and the use of digital wallets and electronic payment systems. However, they are not designed for heavy video editing, advanced software development environments, or professional engineering and design tools such as AutoCAD. This limitation does not materially reduce their relevance, as global labour market data indicate that approximately 70–75 per cent of online work worldwide is browser-based and fully compatible with tablet-class devices.

Device Suitability for Dual Use

Among commonly deployed devices, the Chromebook Duet and Acer Chromebook Tab offer the strongest balance between learning and online work, making them the most effective all-round options. Android tablets such as the Samsung Galaxy Tab A8 or A9 and the Nokia T20 also perform reliably when supplemented with keyboards, with the latter offering particularly strong battery endurance. Budget-oriented devices such as the Xiaomi Redmi Pad remain suitable for learning and basic work tasks, though with some limitations in sustained productivity. Across all device types, battery efficiency remains a decisive advantage.

Power and Energy Considerations

In disaster-affected and power-scarce environments, tablets outperform conventional laptops. A battery life of 10–12 hours effectively supports a full day of online work or study. Offline drafting of documents with later synchronisation further reduces dependence on continuous connectivity. The use of solar chargers and power banks can extend operational capacity significantly, making these devices particularly suitable for temporary shelters and community learning hubs.

Payment and Income Feasibility in the Sri Lankan Context

From a financial inclusion perspective, these devices are fully compatible with commonly used payment systems. Platforms such as PayPal (within existing national constraints), Payoneer, Wise, LankaQR, local banking applications, and NGO stipend mechanisms are all accessible through Android and ChromeOS environments. Notably, many Sri Lankan freelancers already conduct income-generating activities entirely via mobile devices, confirming the practical feasibility of tablet-based earning.

Strategic National Value

The dual use of tablets for both education and income generation carries significant strategic value for Sri Lanka. It helps prevent long-term dependency by enabling families to rebuild livelihoods, creates structured earning pathways for youth, and transforms disaster relief interventions into resilience-building investments. This approach supports a human resource management–driven recovery model rather than a welfare-dependent one. It aligns directly with the outcomes sought by the Ministry of Education, the Ministry of Labour and HRM reform initiatives, and broader national productivity and competitiveness goals.

Policy Positioning under the Vivonta / PPA Framework

Within the Vivonta/Proprietary Planters Alliance national response framework, it is recommended that these devices be formally positioned as “Learning + Livelihood Tablets.” This designation reflects their dual public value and supports a structured governance approach. Devices should be configured with dual profiles—Student and Worker—supplemented by basic digital job readiness modules, clear ethical guidance on online work, and safeguards against exploitation, particularly for vulnerable populations.

Performance Indicators

From a monitoring perspective, the expected reach of such an intervention is high, encompassing students, youth, and displaced adults. The anticipated impact is very high, as it directly enables the transition from education to income generation. Confidence in the approach is high due to extensive global precedent, while the required effort remains moderate, centering primarily on training, coordination, and platform curation rather than capital-intensive investment.

We respectfully invite the Open University of Sri Lanka, Derana, Sirasa, Rupavahini, DP Education, and Janith Wickramasinghe, National Online Job Coach, to join hands under a single national banner—
“Lighting the Dreams of Sri Lanka’s Emerging Leaders.”

by Lalin I De Silva, FIPM (SL) ✍️

 

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